What is the Difference Between Cuttlefish and Squid?

Cuttlefish and squid are both cephalopods, but they have some key differences in their appearance, behavior, and ecology. Here are the main differences between the two:

Body Shape: Squid have a more streamlined, torpedo-like shape, while cuttlefish have a wider, rounder body with a large head.
Fins: Cuttlefish have fan-like fins on either side of their head, while squid do not.
Size: Squid can grow larger than cuttlefish.
Eyes: Cuttlefish have large, W-shaped pupils, while squid have round, circular pupils.
Arms and Tentacles: Squid have ten arms, with two of them longer and used for hunting prey, while cuttlefish have eight arms and two tentacles.
Hunting Behavior: Cuttlefish are more passive predators, using their ability to change color and pattern to blend in with their surroundings and ambush prey. Squid, on the other hand, are more active hunters, using their speed and agility to catch prey.
Shell: Both squid and cuttlefish have remnants of their ancient external shells, but these hard structures look quite different. Squid have a flexible, internal shell called a gladius or pen, while cuttlefish have an internal shell called a cuttlebone.
Social Behavior: Squid live in groups, usually called a shoal or school, while cuttlefish are usually solitary, but sometimes migrate in groups for reproduction.

In terms of culinary uses, both cuttlefish and squid are popular seafood choices around the world. They are both low in fat and high in protein, making them a healthy addition to any diet. However, there are some differences in their flavor and texture, with cuttlefish having a slightly sweeter and more tender flesh compared to squid.